Parents and teens have long been warned that not getting enough sleep can be unhealthy. However,with the demands of schoolwork, activities and family responsibilities teens often don't spend enough time on sleep. According to one study, only 15% of teens are getting 8-10 hours of sleep a night they need to function best.
  High school English teacher and writer Emily Genser says, "My kids are always asking for naptime! Their lives at home are very stressful.I would be more likely to push for later start times for high school students. They would benefit from another hour of sleep." Not enough sleep is not only bad for teens' health, but it can also wreak havoc with their academic （学业的） and athletic performance. It is found that not enough sleep can be linked with drinking, smoking and drug use.
  Some high schools are trying a different way. They are allowing tired students to take an a pin school during the school day in specially designed EnergyPods or just allowing them to spend time in a "quiet room" where technology and conversation are banned. Schools say that a little rest during a tight school day helps students face mounting pressure to get into college.
  Because students who sleep better do better and not all of our schools offer naptime, here are some suggestions to help our teens get the sleep they need：
  ▲Just like in earlier childhood, parents should create a calm atmosphere in the house at bedtime.
  ▲Encourage a relaxing, regular routine（常规） before bedtime which gives the man opportunity to relax.
  ▲Persuade them to avoid caffeine after 4pm.
  ▲If they do nap, tell them to keep daytime naps less than an hour.
  ▲Teach them that alcohol and nicotine not only damage their health, but affect their sleep.
  ▲Show them how regular exercise and a healthy diet promote（促进） good sleep.



What does Paragraph 1 mainly want to show？ ______

A. Today's teens are under too much pressure.
B. Not getting enough sleep harms teens' health.
C. Today's teens generally don't get enough sleep.
D. Teenage students should be helped to function best.

What does the underlined part "wreak havoc with" in Paragraph 2 mean？ ______

A. Do great harm to.
B. Get along with.
C. Take the place of.
D. Make a contribution to.

Why are Energy Pods created for students at some schools？ ______

A. To reduce students' pressure.
B. To help students get refreshed.
C. To prevent students from talking.
D. To reduce the usage of technology.

What should parents do according to the last part of the text？ ______

A. Create a calm atmosphere the whole day.
B. Prevent their children from drinking coffee all the time.
C. Encourage exercise and healthy eating at home.
D. Make sure their teen snap for at least an hour daily.